This introduction presents the essays belonging to the JCOM special issue on User-led and peer-to-peer science. It also draws a first map of the main problems we need to investigate when we face this new and emerging phenomenon. Web tools are enacting and facilitating new ways for lay people to interact with scientists or to cooperate with each other, but cultural and political changes are also at play. What happens to expertise, knowledge production and relations between scientific institutions and society when lay people or non-scientists go online and engage in scientific activities? From science blogging and social networks to garage biology and open tools for user-led research, P2P science challenges many assumptions about public participation in scientific knowledge production. And it calls for a radical and perhaps new kind of openness of scientific practices towards society.

In a brief text written in 1990, Gilles Deleuze took his friend Michel Foucault’s work as a starting point and spoke of new forces at work in society. The great systems masterfully described by Foucault as being related to “discipline” (family, factory, psychiatric hospital, prison, school), were all going through a crisis. On the other hand, the reforms  advocated by ministers throughout the world (labour, welfare, education and health reforms) were nothing but ways to protract their anguish. Deleuze named “control society” the emerging configuration.

Jcom’s adventure was launched nearly eight years ago, when a group of lecturers and former students of the Master’s degree in Science Communication at SISSA of Trieste, decided to have training joined by the commitment to research on science communication issues.

The recent events related to the spread of the influenza virus A (H1N1) have drawn again the attention of science communication experts to old issues, including a couple of issues we deem particularly important: risk communication and the role of scientific journalists in the society of knowledge.

A recent article published in Science Communication addresses the training issue in issue in our discipline. Henk Mulder and his colleagues discuss the shared features that university curricula should or could have to favour the full admission of science communication into the academic circle. Having analysed analogies and differences in the curricula that a number of schools provide all over the world, the authors reached the conclusion that much remains to be done. Science communication seems far from having found shared fundamental references, lessons that cannot be missed in the practical-theoretical education of future professionals or researchers in this discipline. What should one study to become a good science communicator? And to make innovative research?

Human health has currently to face a growing series of global issues. From the spread of HIV/AIDS to a fresh outbreak of tuberculosis, increasingly drug-resistant, the world is witnessing a return, mostly unexpected, of infectious diseases. At the same time, the economic growth in many regions of the globe is generating a sort of “epidemics of wellbeing diseases”: obesity, diabetes, heart disease.

Martin W. Bauer is right, two evolutionary processes are under way. These are quite significant and, in some way, they converge into public science communication: a deep evolution of discourse is unfolding, along with an even deeper change of the public understanding of science.

Those studying the public understanding of science and risk perception have held it clear for long: the relation between information and judgment elaboration is not a linear one at all. Among the reasons behind it, on the one hand, data never are totally “bare” and culturally neutral; on the other hand, in formulating a judgment having some value, the analytic component intertwines – sometimes unpredictably – with the cultural history and the personal elaboration of anyone of us.

The major Lisbon goal is to give Europe back the primacy as a society of knowledge. `Giving back' is a more appropriate term than `giving', as Europe long held that primacy in the past, and virtually as a monopoliser from the 17th century throughout the 19th. Then, Europe shared it with North America for a long portion of the 20th century.

The Norwegian Nobel Committee has bestowed the 2007 Nobel Peace Price equally upon the scientists of the Intergovernmental Panel on Climate Change (IPCC) and Al Gore, former vice-President of the United States of America, with the same motivation: «for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change».